Late Diagnosis

I did not *officially* learn that I had asperger's/autism until 11 months ago - just before my 46th birthday. I always suspected that I was "different" (odd/unusual, etc), but I thought it was probably emotional, or perhaps a chemical imbalance, etc.
I began to consider Asperger's after I was directed to 2 online tests (on the Cambridge test I scored 43 out of 50; on the other test I scored: (Aspie) 178 out of 200, (neurotypical) 26 out of 200).
I had a professional confirm the diagnosis.
People without this disorder can have no idea how difficult my life has been, or what an enormous struggle that simple encounters/relationships have been. Despite a high IQ, I wasn't able to cope with my problems to successfully navigate academics.
I was just wondering about the ages of others who first learn of their diagnosis, and their issues/difficulties/advice, etc., in dealing with it.

I saw you message and would like to know how did you get diagnosed?
Did they do any specific testing for an older adult?
Did they make a diagnosis based on history?
I suspect my daughter who is 18yo now is autistic. I am trying to find a provider who can give her a definitive diagnosis. The difficulty in getting someone who can assess, evaluate and implement care for her is really difficult due to recent events which include a traumatic hospital stay. She is now afraid of Doctors and nurses.

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